package com.ljy.day1;

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

public class Crawler4_HttpClientPool {
    public static void main(String[] args) {
        // 创建连接池管理器
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        // 设置最大连接数
        cm.setMaxTotal(100);
        // 设置每个主机的最大连接数
        cm.setDefaultMaxPerRoute(10);
        // 使用连接池管理器发起请求
        doGet(cm);
        doGet(cm);
    }
    private static void doGet(PoolingHttpClientConnectionManager cm){
        // 不是每次创建新的HttpClient，而是从连接池中获取HttpClient对象
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).build();
        HttpGet httpGet = new HttpGet("http://www.itcast.cn");
        CloseableHttpResponse response = null;
        try{
            response = httpClient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == 200) {
                String content = EntityUtils.toString(response.getEntity(), "utf8");
                System.out.println(content.length());
            }

        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                // 不能关闭HttpClient，由连接池管理HttpClient
                // httpClient.close();
            }
        }
    }
}
